Here is a testing day for Dux Ryu Ninjutsu, grandmaster Hanshi Frank W Dux is present and he is watching the student that does the Dim Mak test. The glass is not allowed to break and he has to break the brick that is on the bottom. Hanshi Frank W Dux is known for Dux Ryu Ninjitsu, Koga Yamabushi Ryu Ninjutsu and ofcourse he was the inspiration for the movie bloospsort with Jean Claude Van Damme . Watch this video of Dux Ryu Ninjitsu